I find it unlikely but possible. I am surprised I have never been ran down by one or more for that fact.
As some of you know I have a mass of Hummers around me. You may have seen the pics from last year, more to come.
But these crazy little guy's are DEFINITELY not scared of me. Which is cool. I sit out back very close to one of the feeders. But I can't count the number of times one or more has buzzed past me at a million MPH literally a foot or less off my body. It's pretty cool yet sometimes rather unnerving especially when one fly's by a few inches of your face and your not ready.